Flux for soldering aluminium.



UNITED STATES v PATENT OFFICEEQ \VI-LLI-AM 'S BATES, OF CHICAGO, ILLINOIS, ASSIGNOR OF TVVO-TIIIRDS TO IVAIIIER'O. PEACOCK AND OSCAR F. ENGWALL, OF SAME PLACE.

FLUX FOR SOLDERING ALUMINIUM.

/ SPECIFICATION forming part of Letters Patent No. 648,831, dated May 1, 1900. Application filed March 24, 1897- Serial No. 329,071. (No specimens.)

To all whom it may concern:

Be it known that I, WILLIAM S. BATES, of Chicago, Illinois, have invented certain new and useful Improvements in Fluxes for S01- dering Aluminium, whereof the following is a specification.

My invention consists in the discovery,

. made by myself, that fiuorids, combined with easily-fusible chlorids and other halogens,

constitiite efficient solderingfluxes foraluminium.

In carrying out my invention I mix lithium ohloridvwith potassium fluorid, and for convenience in use fuse them together and pulverize them. 'The proportions of the salts may hflrv'aried considerably; but those which tirely substituted by such chlorids without destro 'ng the eificiency of the flux. Lithium ch orid, however, has a special utility in this connection because of its low fusingpoint and great fluidity when fused, and its presence is always desirable. So, also, other fluorids maybe substituted for potassium fluorid. I have thus used sodium, calcium, lead, zinc, and other fiuorids.

changes are within my invention, as also is the use of other equivalent salts for the above.

\Vith this flux ordinary solders may be used. I have obtained good results with tin, lead, zinc, and various alloys thereof, incl uding common plumbers solder, also with silver solder and with alloys of aluminium and tin containing as high as seventy per cent. of aluminium and with other solders.

I claim 1. A flux for soldering aluminium contaim ing lithium chlorid and potassium fiuorid,

substantially as set forth.

5. A flux forsolderingaluminium, containing a fluorid and a fusible diluent, substantially as set forth.

\VILLIAM S. HATES.

In presence of+ JULIA-M. BRISTOL, JOHN L. .TAoKsoN.

All such 

